Understanding Cloud Computing: Architecture, Services, and Key Providers

Cloud computing is an Internet‑based computing model that provides resources such as compute power, storage, databases, and applications to users.

The core idea is to treat computing resources as services, billed by actual usage.

Cloud Computing Architecture

Architecture consists of four main components:

Compute resources : virtual machines (VMs), containers, and Function‑as‑a‑Service (FaaS).

Storage : object storage, block storage, and file storage, often built on distributed file systems and databases.

Network : connectivity, security (firewalls, VPN, IDS/IPS), and management.

Monitoring & Management : tools for observing performance, cost, and security.

Types of Cloud Services

Cloud services are typically offered in three layers, each building on the previous one.

IaaS (Infrastructure as a Service)

IaaS provides fundamental compute, storage, and networking resources. Major providers include:

AWS : EC2, S3, EBS

Microsoft Azure : Virtual Machines, Blob Storage, Virtual Network

Google Cloud Platform : Compute Engine, Cloud Storage, VPC

Alibaba Cloud : Elastic Compute Service (ECS), Object Storage Service (OSS), Block Storage

PaaS (Platform as a Service)

PaaS offers development, deployment, and management platforms, including frameworks, runtimes, databases, and storage, allowing developers to focus on application code without managing underlying infrastructure.

SaaS (Software as a Service)

SaaS delivers software applications over the Internet on a pay‑as‑you‑go basis. Typical SaaS offerings include office collaboration tools, customer relationship management, online meeting platforms, and human‑resource management systems.